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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5bbad4e2c3a2a64bf470928343d3f9ea7eb61db299b9cf51d172548712e5c7b' 
  AND token = 'yVrK6l1BL0PE0UP7AQrZykIucRjm1CWGfzkEppfgFkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}